Rvdberg: Studies on the Rocky Mountain Flora 282 



linear-lanceolate or of the upper leaves filiform, acute or attenuate : 

 flowers light yellow : petals scarcely exceeding the sepals : pedicels 

 very short in flower ; in fruit 4-6 mm. long, ascending or almost 

 erect : pods 8-10 mm. long, erect, more or less curved, especially 

 those of the branches, scarcely exceeding 7 mm. in width, more or 

 less constricted between the seeds ; beak slender, short, about .5 

 mm. long : seeds uniserial, red, a little over i mm. long. 



This species has the short pedicels and erect pods of 5. Hart- 

 ivegiana, but the pod of the latter is more slender, and often 

 curved, the whole plant is greener and conspicuously glandular, 

 and the se2:ments of the leaves are more slender. The latter char- 

 acter and the short ascending or erect pedicels distinguish it from 

 ^. incisa Engelm. It grows at an altitude of 1000-1500 m. 



Wyoming : Rolling plains between Sheridan and Buffalo, 1900, 

 F. Tivecdy, 35g2. 



Sedum frigidum sp. nov. 



Perennial with a fleshy rootstock, dioecious. Stems usually 

 less than i dm. high, light green : leaves flat, 1-1.5 cm. long and 

 5-7 mm. wide, sessile, obovate or oblong-obovate, often dentate 

 above the middle, or entire, acute : inflorescence dense, usually dark 

 purple : flowers 4— 5-merous, usually 5-merous : sepals of the 

 staminate flowers lanceolate, acute, 1.5-2 mm. long, dark purple or 

 rarely greenish : petals oblanceolate or oblong, acute, about 3 mm. 

 long, dark purple or very rarely greenish tinged with purple : fila- 

 ments filiform, purple, about one third longer than the petals, the 

 pistillate similar but with somewhat shorter and more obtuse petals : 

 follicles 3-5 mm. long, oblong, with a very short beak about .5 

 mm. long, divergent or at last recurved. 



This species has gone under the name of ^. roseuvi (L.) Scop., 

 but is quite unlike the northern European plant, which must be re- 

 garded as the type of RJiodiola rosea L. This has a very short, 

 almost tuberous rootstock, more oblanceolate leaves about 3 cm. 

 long, usually with very sharp dentations, usually yellow petals, 

 longer filaments almost twice as long as the petals and follicle^, 6- 

 8 mm. long. This form is also found in the mountains of southern 

 Europe ; but there seems to be another European plant ; this is de- 

 scribed and figured under the name RJiodiola rosea in the " Flora von 

 Deutschland" published by Schlechtendal, Langethal and Schenk. 

 It resembles more the Rocky Mountain plant in the purple, 

 flowers and short stamens, but it has more inversely deltoid leaves. 



